<?php
/*
* Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.html or http://ckeditor.com/license
*/
 
/**
 * \brief CKEditor class that can be used to create editor
 * instances in PHP pages on server side.
 * @see http://ckeditor.com
 *
 * Sample usage:
 * @code
 * $CKEditor = new CKEditor();
 * $CKEditor->editor("editor1", "<p>Initial value.</p>");
 * @endcode
 */
class CKEditor
{
        /**
         * The version of %CKEditor.
         */
        const version = '3.6.1';
        /**
         * A constant string unique for each release of %CKEditor.
         */
        const timestamp = 'B5GJ5GG';
 
        /**
         * URL to the %CKEditor installation directory (absolute or relative to document root).
         * If not set, CKEditor will try to guess it's path.
         *
         * Example usage:
         * @code
         * $CKEditor->basePath = '/ckeditor/';
         * @endcode
         */
        public $basePath;
        /**
         * An array that holds the global %CKEditor configuration.
         * For the list of available options, see http://docs.cksource.com/ckeditor_api/symbols/CKEDITOR.config.html
         *
         * Example usage:
         * @code
         * $CKEditor->config['height'] = 400;
         * // Use @@ at the beggining of a string to ouput it without surrounding quotes.
         * $CKEditor->config['width'] = '@@screen.width * 0.8';
         * @endcode
         */
        public $config = array();
        /**
         * A boolean variable indicating whether CKEditor has been initialized.
         * Set it to true only if you have already included
         * &lt;script&gt; tag loading ckeditor.js in your website.
         */
        public $initialized = false;
        /**
         * Boolean variable indicating whether created code should be printed out or returned by a function.
         *
         * Example 1: get the code creating %CKEditor instance and print it on a page with the "echo" function.
         * @code
         * $CKEditor = new CKEditor();
         * $CKEditor->returnOutput = true;
         * $code = $CKEditor->editor("editor1", "<p>Initial value.</p>");
         * echo "<p>Editor 1:</p>";
         * echo $code;
         * @endcode
         */
        public $returnOutput = false;
        /**
         * An array with textarea attributes.
         *
         * When %CKEditor is created with the editor() method, a HTML &lt;textarea&gt; element is created,
         * it will be displayed to anyone with JavaScript disabled or with incompatible browser.
         */
        public $textareaAttributes = array( "rows" => 8, "cols" => 60 );
        /**
         * A string indicating the creation date of %CKEditor.
         * Do not change it unless you want to force browsers to not use previously cached version of %CKEditor.
         */
        public $timestamp = "B5GJ5GG";
        /**
         * An array that holds event listeners.
         */
        private $events = array();
        /**
         * An array that holds global event listeners.
         */
        private $globalEvents = array();
 
        /**
         * Main Constructor.
         *
         *  @param $basePath (string) URL to the %CKEditor installation directory (optional).
         */
        function __construct($basePath = null) {
                if (!empty($basePath)) {
                        $this->basePath = $basePath;
                }
        }
 
        /**
         * Creates a %CKEditor instance.
         * In incompatible browsers %CKEditor will downgrade to plain HTML &lt;textarea&gt; element.
         *
         * @param $name (string) Name of the %CKEditor instance (this will be also the "name" attribute of textarea element).
         * @param $value (string) Initial value (optional).
         * @param $config (array) The specific configurations to apply to this editor instance (optional).
         * @param $events (array) Event listeners for this editor instance (optional).
         *
         * Example usage:
         * @code
         * $CKEditor = new CKEditor();
         * $CKEditor->editor("field1", "<p>Initial value.</p>");
         * @endcode
         *
         * Advanced example:
         * @code
         * $CKEditor = new CKEditor();
         * $config = array();
         * $config['toolbar'] = array(
         *     array( 'Source', '-', 'Bold', 'Italic', 'Underline', 'Strike' ),
         *     array( 'Image', 'Link', 'Unlink', 'Anchor' )
         * );
         * $events['instanceReady'] = 'function (ev) {
         *     alert("Loaded: " + ev.editor.name);
         * }';
         * $CKEditor->editor("field1", "<p>Initial value.</p>", $config, $events);
         * @endcode
         */
        public function editor($name, $value = "", $config = array(), $events = array())
        {
                $attr = "";
                foreach ($this->textareaAttributes as $key => $val) {
                        $attr.= " " . $key . '="' . str_replace('"', '&quot;', $val) . '"';
                }
                $out = "<textarea name=\"" . $name . "\"" . $attr . ">" . htmlspecialchars($value) . "</textarea>\n";
                if (!$this->initialized) {
                        $out .= $this->init();
                }
 
                $_config = $this->configSettings($config, $events);
 
                $js = $this->returnGlobalEvents();
                if (!empty($_config))
                        $js .= "CKEDITOR.replace('".$name."', ".$this->jsEncode($_config).");";
                else
                        $js .= "CKEDITOR.replace('".$name."');";
 
                $out .= $this->script($js);
 
                if (!$this->returnOutput) {
                        print $out;
                        $out = "";
                }
 
                return $out;
        }
 
        /**
         * Replaces a &lt;textarea&gt; with a %CKEditor instance.
         *
         * @param $id (string) The id or name of textarea element.
         * @param $config (array) The specific configurations to apply to this editor instance (optional).
         * @param $events (array) Event listeners for this editor instance (optional).
         *
         * Example 1: adding %CKEditor to &lt;textarea name="article"&gt;&lt;/textarea&gt; element:
         * @code
         * $CKEditor = new CKEditor();
         * $CKEditor->replace("article");
         * @endcode
         */
        public function replace($id, $config = array(), $events = array())
        {
                $out = "";
                if (!$this->initialized) {
                        $out .= $this->init();
                }
 
                $_config = $this->configSettings($config, $events);
 
                $js = $this->returnGlobalEvents();
                if (!empty($_config)) {
                        $js .= "CKEDITOR.replace('".$id."', ".$this->jsEncode($_config).");";
                }
                else {
                        $js .= "CKEDITOR.replace('".$id."');";
                }
                $out .= $this->script($js);
 
                if (!$this->returnOutput) {
                        print $out;
                        $out = "";
                }
 
                return $out;
        }
 
        /**
         * Replace all &lt;textarea&gt; elements available in the document with editor instances.
         *
         * @param $className (string) If set, replace all textareas with class className in the page.
         *
         * Example 1: replace all &lt;textarea&gt; elements in the page.
         * @code
         * $CKEditor = new CKEditor();
         * $CKEditor->replaceAll();
         * @endcode
         *
         * Example 2: replace all &lt;textarea class="myClassName"&gt; elements in the page.
         * @code
         * $CKEditor = new CKEditor();
         * $CKEditor->replaceAll( 'myClassName' );
         * @endcode
         */
        public function replaceAll($className = null)
        {
                $out = "";
                if (!$this->initialized) {
                        $out .= $this->init();
                }
 
                $_config = $this->configSettings();
 
                $js = $this->returnGlobalEvents();
                if (empty($_config)) {
                        if (empty($className)) {
                                $js .= "CKEDITOR.replaceAll();";
                        }
                        else {
                                $js .= "CKEDITOR.replaceAll('".$className."');";
                        }
                }
                else {
                        $classDetection = "";
                        $js .= "CKEDITOR.replaceAll( function(textarea, config) {\n";
                        if (!empty($className)) {
                                $js .= "        var classRegex = new RegExp('(?:^| )' + '". $className ."' + '(?:$| )');\n";
                                $js .= "        if (!classRegex.test(textarea.className))\n";
                                $js .= "                return false;\n";
                        }
                        $js .= "        CKEDITOR.tools.extend(config, ". $this->jsEncode($_config) .", true);";
                        $js .= "} );";
 
                }
 
                $out .= $this->script($js);
 
                if (!$this->returnOutput) {
                        print $out;
                        $out = "";
                }
 
                return $out;
        }
 
        /**
         * Adds event listener.
         * Events are fired by %CKEditor in various situations.
         *
         * @param $event (string) Event name.
         * @param $javascriptCode (string) Javascript anonymous function or function name.
         *
         * Example usage:
         * @code
         * $CKEditor->addEventHandler('instanceReady', 'function (ev) {
         *     alert("Loaded: " + ev.editor.name);
         * }');
         * @endcode
         */
        public function addEventHandler($event, $javascriptCode)
        {
                if (!isset($this->events[$event])) {
                        $this->events[$event] = array();
                }
                // Avoid duplicates.
                if (!in_array($javascriptCode, $this->events[$event])) {
                        $this->events[$event][] = $javascriptCode;
                }
        }
 
        /**
         * Clear registered event handlers.
         * Note: this function will have no effect on already created editor instances.
         *
         * @param $event (string) Event name, if not set all event handlers will be removed (optional).
         */
        public function clearEventHandlers($event = null)
        {
                if (!empty($event)) {
                        $this->events[$event] = array();
                }
                else {
                        $this->events = array();
                }
        }
 
        /**
         * Adds global event listener.
         *
         * @param $event (string) Event name.
         * @param $javascriptCode (string) Javascript anonymous function or function name.
         *
         * Example usage:
         * @code
         * $CKEditor->addGlobalEventHandler('dialogDefinition', 'function (ev) {
         *     alert("Loading dialog: " + ev.data.name);
         * }');
         * @endcode
         */
        public function addGlobalEventHandler($event, $javascriptCode)
        {
                if (!isset($this->globalEvents[$event])) {
                        $this->globalEvents[$event] = array();
                }
                // Avoid duplicates.
                if (!in_array($javascriptCode, $this->globalEvents[$event])) {
                        $this->globalEvents[$event][] = $javascriptCode;
                }
        }
 
        /**
         * Clear registered global event handlers.
         * Note: this function will have no effect if the event handler has been already printed/returned.
         *
         * @param $event (string) Event name, if not set all event handlers will be removed (optional).
         */
        public function clearGlobalEventHandlers($event = null)
        {
                if (!empty($event)) {
                        $this->globalEvents[$event] = array();
                }
                else {
                        $this->globalEvents = array();
                }
        }
 
        /**
         * Prints javascript code.
         *
         * @param string $js
         */
        private function script($js)
        {
                $out = "<script type=\"text/javascript\">";
                $out .= "//<![CDATA[\n";
                $out .= $js;
                $out .= "\n//]]>";
                $out .= "</script>\n";
 
                return $out;
        }
 
        /**
         * Returns the configuration array (global and instance specific settings are merged into one array).
         *
         * @param $config (array) The specific configurations to apply to editor instance.
         * @param $events (array) Event listeners for editor instance.
         */
        private function configSettings($config = array(), $events = array())
        {
                $_config = $this->config;
                $_events = $this->events;
 
                if (is_array($config) && !empty($config)) {
                        $_config = array_merge($_config, $config);
                }
 
                if (is_array($events) && !empty($events)) {
                        foreach ($events as $eventName => $code) {
                                if (!isset($_events[$eventName])) {
                                        $_events[$eventName] = array();
                                }
                                if (!in_array($code, $_events[$eventName])) {
                                        $_events[$eventName][] = $code;
                                }
                        }
                }
 
                if (!empty($_events)) {
                        foreach($_events as $eventName => $handlers) {
                                if (empty($handlers)) {
                                        continue;
                                }
                                else if (count($handlers) == 1) {
                                        $_config['on'][$eventName] = '@@'.$handlers[0];
                                }
                                else {
                                        $_config['on'][$eventName] = '@@function (ev){';
                                        foreach ($handlers as $handler => $code) {
                                                $_config['on'][$eventName] .= '('.$code.')(ev);';
                                        }
                                        $_config['on'][$eventName] .= '}';
                                }
                        }
                }
 
                return $_config;
        }
 
        /**
         * Return global event handlers.
         */
        private function returnGlobalEvents()
        {
                static $returnedEvents;
                $out = "";
 
                if (!isset($returnedEvents)) {
                        $returnedEvents = array();
                }
 
                if (!empty($this->globalEvents)) {
                        foreach ($this->globalEvents as $eventName => $handlers) {
                                foreach ($handlers as $handler => $code) {
                                        if (!isset($returnedEvents[$eventName])) {
                                                $returnedEvents[$eventName] = array();
                                        }
                                        // Return only new events
                                        if (!in_array($code, $returnedEvents[$eventName])) {
                                                $out .= ($code ? "\n" : "") . "CKEDITOR.on('". $eventName ."', $code);";
                                                $returnedEvents[$eventName][] = $code;
                                        }
                                }
                        }
                }
 
                return $out;
        }
 
        /**
         * Initializes CKEditor (executed only once).
         */
        private function init()
        {
                static $initComplete;
                $out = "";
 
                if (!empty($initComplete)) {
                        return "";
                }
 
                if ($this->initialized) {
                        $initComplete = true;
                        return "";
                }
 
                $args = "";
                $ckeditorPath = $this->ckeditorPath();
 
                if (!empty($this->timestamp) && $this->timestamp != "%"."TIMESTAMP%") {
                        $args = '?t=' . $this->timestamp;
                }
 
                // Skip relative paths...
                if (strpos($ckeditorPath, '..') !== 0) {
                        $out .= $this->script("window.CKEDITOR_BASEPATH='". $ckeditorPath ."';");
                }
 
                $out .= "<script type=\"text/javascript\" src=\"" . $ckeditorPath . 'ckeditor.js' . $args . "\"></script>\n";
 
                $extraCode = "";
                if ($this->timestamp != self::timestamp) {
                        $extraCode .= ($extraCode ? "\n" : "") . "CKEDITOR.timestamp = '". $this->timestamp ."';";
                }
                if ($extraCode) {
                        $out .= $this->script($extraCode);
                }
 
                $initComplete = $this->initialized = true;
 
                return $out;
        }
 
        /**
         * Return path to ckeditor.js.
         */
        private function ckeditorPath()
        {
                if (!empty($this->basePath)) {
                        return $this->basePath;
                }
 
                /**
                 * The absolute pathname of the currently executing script.
                 * Note: If a script is executed with the CLI, as a relative path, such as file.php or ../file.php,
                 * $_SERVER['SCRIPT_FILENAME'] will contain the relative path specified by the user.
                 */
                if (isset($_SERVER['SCRIPT_FILENAME'])) {
                        $realPath = dirname($_SERVER['SCRIPT_FILENAME']);
                }
                else {
                        /**
                         * realpath - Returns canonicalized absolute pathname
                         */
                        $realPath = realpath( './' ) ;
                }
 
                /**
                 * The filename of the currently executing script, relative to the document root.
                 * For instance, $_SERVER['PHP_SELF'] in a script at the address http://example.com/test.php/foo.bar
                 * would be /test.php/foo.bar.
                 */
                $selfPath = dirname($_SERVER['PHP_SELF']);
                $file = str_replace("\\", "/", __FILE__);
 
                if (!$selfPath || !$realPath || !$file) {
                        return "/ckeditor/";
                }
 
                $documentRoot = substr($realPath, 0, strlen($realPath) - strlen($selfPath));
                $fileUrl = substr($file, strlen($documentRoot));
                $ckeditorUrl = str_replace("ckeditor_php5.php", "", $fileUrl);
 
                return $ckeditorUrl;
        }
 
        /**
         * This little function provides a basic JSON support.
         *
         * @param mixed $val
         * @return string
         */
        private function jsEncode($val)
        {
                if (is_null($val)) {
                        return 'null';
                }
                if (is_bool($val)) {
                        return $val ? 'true' : 'false';
                }
                if (is_int($val)) {
                        return $val;
                }
                if (is_float($val)) {
                        return str_replace(',', '.', $val);
                }
                if (is_array($val) || is_object($val)) {
                        if (is_array($val) && (array_keys($val) === range(0,count($val)-1))) {
                                return '[' . implode(',', array_map(array($this, 'jsEncode'), $val)) . ']';
                        }
                        $temp = array();
                        foreach ($val as $k => $v){
                                $temp[] = $this->jsEncode("{$k}") . ':' . $this->jsEncode($v);
                        }
                        return '{' . implode(',', $temp) . '}';
                }
                // String otherwise
                if (strpos($val, '@@') === 0)
                        return substr($val, 2);
                if (strtoupper(substr($val, 0, 9)) == 'CKEDITOR.')
                        return $val;
 
                return '"' . str_replace(array("\\", "/", "\n", "\t", "\r", "\x08", "\x0c", '"'), array('\\\\', '\\/', '\\n', '\\t', '\\r', '\\b', '\\f', '\"'), $val) . '"';
        }
}